This means that D = f(l,ρ,μV,g) where f is some function. What exactly is the drag a function of? These variables need to be chosen correctly, though selection of such variables depends largely on one's experience in the topic. Say that we are interested in the drag, D, which is a force on a ship. In this case, mass ≡ F/a, which makes the units of mass as FT²/L, since acceleration has units of L/T².Īn elementary method for finding a functional relationship with respect to a parameter in interest is the Rayleigh Method, and will be illustrated with an example, using the MLT system. are referred to as the derived units.Īnother system for dimensionless analysis is the FLT system, the force, length, time system. All other quantities can be expressed in terms of these basic units. The defined units are based on the modern MLT system: mass, length, time. 2.3 Step 3: Determining the dimensionless groups.
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